#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
using namespace std;

int main()
{
    int fds[2]={0};
    int n=pipe(fds);
    // if(n!=0)//管道创建失败
    // {
    //     std::cerr<<"pipe error"<<std::endl;//输出错误
    //     return 1;
    // }
    //创建子进程
    pid_t id=fork();
    if(id<0)
    {
        std::cerr<<"fork error"<<std::endl;
        return 2;
    }
    else if(id==0)
    {
        //子进程
        close(fds[0]);
        int cnt=0;
        while(true)
        {
            std::string message = "hello bit,hello";
            message += std::to_string(getpid());
            message += ",";
            message += std::to_string(cnt);

            ::write(fds[1],message.c_str(),message.size());
            cnt++;
            sleep(1);
        }
        close(fds[1]);
        exit(0);
    }
    else
    {
        //父进程
        close(fds[1]);
        char buffer[1024];
        while(true)
        {
            ssize_t n=::read(fds[0],buffer,1024);
            if(n>0)
            {
                buffer[n]=0;
                std::cout<<"child->father,message:"<<buffer<<std::endl;
            }
        }
        close(fds[0]);
        
        int status=0;
        pid_t rid=waitpid(id,&status,0);
        std::cout<<"father wait child success:"<<rid<<"exit code:"<<((status<<8)&0xFF)<<std::endl;
    }

    return 0;
}



